Diff-Serv使用IP报文ToS域的（）来区分并标记IP报文。

A:前六位 B:前五位 C:前四位 D:前三位

具有光复用段保护功能的OptiXBWS320G系统，OLP单板检测到（）告警时将会发生倒换

A:POWER-DIFF-DETECT B:POWER-DIFF-OVER C:RLOS D:MS-RDI

什么情况会导致”FEEL DIFF-PRESS”灯亮（）？

A:当A或B液压系统失效时，或当升降舵皮托系统故障时 B:当A或B液压系统失效时，或当机长的空速管探头故障时 C:当A或B液压系统失效时，或当副驾驶的空速管探头故障时 D:当A或B或备用液压系统失效时，或当升降舵皮托系统故障时

What is the ’biggest city in the world That is, (21) city has the largest population This seems like (22) question to answer, but actually it isn’t.
It’s actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn’t easy to determine a city’s boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it’s difficult to determine what the population of a city is because it’s difficult to define what a city is.
The second reason that it is difficult to (25) the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York’s population in 1979 and an (27) of Mexico City’s population in 1981. So we real ly can’t compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.
So we can say that these are our two (29) for comparing the populations of cities: one, it’s difficult to determine the (30) of a city, and two, it is difficult to get accurate information.

A:compile B:compare C:conduct D:conclusion

What is the ’biggest city in the world That is, (21) city has the largest population This seems like (22) question to answer, but actually it isn’t.
It’s actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn’t easy to determine a city’s boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it’s difficult to determine what the population of a city is because it’s difficult to define what a city is.
The second reason that it is difficult to (25) the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York’s population in 1979 and an (27) of Mexico City’s population in 1981. So we real ly can’t compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.
So we can say that these are our two (29) for comparing the populations of cities: one, it’s difficult to determine the (30) of a city, and two, it is difficult to get accurate information.

A:compile B:compare C:conduct D:conclusion

What is the ’biggest city in the world That is, (21) city has the largest population This seems like (22) question to answer, but actually it isn’t.
It’s actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn’t easy to determine a city’s boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it’s difficult to determine what the population of a city is because it’s difficult to define what a city is.
The second reason that it is difficult to (25) the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York’s population in 1979 and an (27) of Mexico City’s population in 1981. So we real ly can’t compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.
So we can say that these are our two (29) for comparing the populations of cities: one, it’s difficult to determine the (30) of a city, and two, it is difficult to get accurate information.

A:compile B:compare C:conduct D:conclusion

What is the ’biggest city in the world That is, (21) city has the largest population This seems like (22) question to answer, but actually it isn’t. It’s actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn’t easy to determine a city’s boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it’s difficult to determine what the population of a city is because it’s difficult to define what a city is. The second reason that it is difficult to (25) the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York’s population in 1979 and an (27) of Mexico City’s population in 1981. So we real ly can’t compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly. So we can say that these are our two (29) for comparing the populations of cities: one, it’s difficult to determine the (30) of a city, and two, it is difficult to get accurate information.

A:compile B:compare C:conduct D:conclusion

Ⅲ Cloze Directions: For each blank in the following passage, there are four choices marked A, B, C and D. Choose the one that is most suitable and mark your answer by blackening the corresponding letter on the Answer Sheet. What is the ’biggest city in the world That is, (21) city has the largest population This seems like (22) question to answer, but actually it isn’t. It’s actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn’t easy to determine a city’s boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it’s difficult to determine what the population of a city is because it’s difficult to define what a city is. The second reason that it is difficult to (25) the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York’s population in 1979 and an (27) of Mexico City’s population in 1981. So we real ly can’t compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly. So we can say that these are our two (29) for comparing the populations of cities: one, it’s difficult to determine the (30) of a city, and two, it is difficult to get accurate information.

A:compile B:compare C:conduct D:conclusion

William, who conquered England some 930 years ago, had wealth, power and a ruthless army. Yet although William was stupefyingly rich by the standard of his time, he had nothing remotely resembling a flush toilet. No paper towels, no riding lawn mower. How did he get by
History books are filled with wealthy people who were practically destitute compared to me, I have tripe-tracked storm window; Croesus did not. Entire nations trembled before Alexander the Great, but he couldn’t buy cat food in bulk. Czar Nicholas Ⅱ lacked a compound-miter saw.
Given how much better off I am than so many famous dead people, you’d think I’d be content. The trouble is that, like most people, I compare my prosperity with that of living persons: neighbors, high-school classmates, TV personalities. The covetousness I feel toward my friend Howard’s kitchen is not mitigated by the fact that no French monarch ever had a refrigerator with glass doors.
There is really no rising or falling standard of living. Over the centuries people simply find different stuff to feel grumpy about. You’d think that merely not having bubonic plague(腺鼠疫) would put us in a good mood. But no, we want a hot tub too.
Of course, one way to achieve happiness would be to realize that even by contemporary standards the things I own are pretty nice. My house is smaller than the houses of many investment bankers’, but even so it has a lot more rooms than my wife’s and I can keep clean. Besides, to people looking back at our era from a century or two in the future, those bankers’ fancy counter tops and my own worn Formica(福米加塑料桌面)will seem equally shabby. I can’t keep up with my neighbor right now. but just wait.

A:are content with their life B:are not as wealthy as the author C:like compare their life with famous dead people D:have tendency to compare their property with others